MAX7359 Maxim, MAX7359 Datasheet - Page 10

• Manufacturer Part Number: MAX7359
• Description: The MAX7359 I²C interfaced peripheral provides microprocessors with management of up to 64 key switches
• Manufacturer: Maxim

2-Wire Interfaced Low-EMI
Key Switch Controller/GPO
The debounce register sets the time for each debounce
cycle, as well as setting whether the GPO ports are
enabled or disabled. Bits D0 through D4 set the
debounce time in increments of 1ms starting at 9ms
Table 5. Debounce Register Format (0x02)
10
Debounce time is 9ms
Debounce time is 10ms
Debounce time is 11ms
Debounce time is 12ms
Debounce time is 37ms
Debounce time is 38ms
Debounce time is 39ms
Debounce time is 40ms
GPO ports disabled (full key-scan functionality)
GPO port 7 enabled
GPO ports 7 and 6 enabled
GPO ports 7, 6, and 5 enabled
GPO ports 7, 6, 5, and 4 enabled
GPO ports 7, 6, 5, 4, and 3 enabled
GPO ports 7, 6, 5, 4, 3, and 2 enabled
Power-up default setting
______________________________________________________________________________________
REGISTER DESCRIPTION
Debounce Register (0x02)
.
.
.
D7
X
X
X
X
X
X
X
X
0
0
0
0
1
1
1
1
PORTS ENABLE
and ending at 40ms (Table 5). Bits D5 through D7 set
which of the GPO ports is enabled. Note the GPO ports
can be enabled only in the combinations shown in
Table 5, from all disabled to all enabled.
D6
X
X
X
X
X
X
X
X
0
0
1
1
0
0
1
1
D5
X
X
X
X
X
X
X
X
0
1
0
1
0
1
X
1
REGISTER DATA
D4
0
0
0
0
1
1
1
1
X
X
X
X
X
X
X
1
D3
DEBOUNCE TIME
0
0
0
0
1
1
1
1
X
X
X
X
X
X
X
1
D2
X
X
X
X
X
X
X
0
0
0
0
1
1
1
1
1
D1
X
X
X
X
X
X
X
0
0
1
1
0
0
1
1
1
D0
X
X
X
X
X
X
X
0
1
0
1
0
1
0
1
1